![]() In Disk Utility, select InstallESD.dmg in the sidebar However, with the 10.7.4 installer, you must use the mounted Mac OS X Install ESD volume or you will get an error at the end of the restore procedure and the newly created bootable drive may not function properly. Note: In versions of the Lion installer prior to 10.7.4, you didn’t need to first mount the InstallESD.dmg image-you could simply drag the image itself into the Source field. The restore procedure will take anywhere from five to 15 minutes, depending on your Mac and the speed of your drive. Click Restore and, if prompted, enter an admin-level username and password.Warning: The next step will erase the destination drive or partition, so make sure it doesn’t contain any valuable data. In Disk Utility, find this destination drive in the sidebar and then drag it into the Destination field on the right if the destination drive has multiple partitions, just drag the partition you want to use as your bootable installer volume. ![]() Steps 1 through 4 in this slideshow to properly format the drive. This drive must be at least 5GB in size (an 8GB flash drive works well), and it must be formatted with a GUID Partition Table.
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